title: Part 21: categoric analysis: Pearson chi-square test.
authors.affiliation: University of Utah, Division of Emergency Medicine, Salt Lake City, UT, USA.
authors.forename: Keith
authors.initials: K
authors.lastname: Curtis
authors.forename: Scott T
authors.initials: ST
authors.lastname: Youngquist
mesh_terms: D017732:Air Ambulances; D016009:Chi-Square Distribution; D006282:Health Personnel / Q000193:education; D006801:Humans; D017214:Laryngeal Masks; D013223:Statistics as Topic / Q000379:methods*